The 25-year-old was gunned down on Wednesday afternoon in Friar Mews in West Norwood.
Paramedics were called around 4pm and after battling to save him, he was pronounced dead at the scene.
Police are examining CCTV footage and have taken forensic information from the scene as part of the investigation.
Two 17-year-old boys were arrested on suspicion of murder on Wednesday.
They have both been bailed pending further enquiries.
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